Have you considered flocking the inside of the scope tube? Also, the inside of the initial/original dewshield? What about flocking the focuser draw tube? You should also check the inside of your diagonal to make sure its either painted flat black or flocked.
I did that to my AR102. Short of shining a torch down the middle. Its pretty much immune to stray light from street lights and nearby homes. I think your dew shield is far too long. Definitely going to have vignetting
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